Quiescent

quiescent \kwī-ˈe-sənt\ adjective: 1. marked by inactivity or repose; tranquilly at rest, 2. causing no trouble or symptoms {quiescent gallstones}

Etymology: Latin quiescent-, quiescens, present participle of quiescere to become quiet, rest, from quies

I hear a phone ring in the distance. It is ignored.